warning: assignment makes pointer from integer without a cast
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编译的时候报警告：warning: assignment makes pointer from integer without a cast
出现这个警告的原因是在使用函数之前没有对函数进行声明，未经声明的函数原型一律默认为返回int值。
这样、就相当于你调用了返回值为int的函数，并将其赋给了char*变量，所有会出现警告。
warning: assignment makes pointer from integer without a cast
warning: assignment makes pointer from integer without a cast
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